$4x^2-12x+9=16$
$\left(x-1\right)\:\:2\:<x\:\left(x\:-\:4\right)\:+\:8$
$\frac{1}{sec^2x-1}$
$2x^2+4;x=1$
$sen\left(x\right)=cos\left(y\right)+c$
$1-3-4+4$
$\int e^{-st}t^2dt$
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